chore: regenerate README (#495)
chore: regenerate README (#495)

This PR was generated using Autosynth. :rainbow:


<details><summary>Log from Synthtool</summary>

```
2021-07-27 22:26:31,589 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-accessapproval/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-07-27 22:26:33,007 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/013fca4f-2f70-43c5-b06e-c4aa68f4da63/targets

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